I found the following in a German discussion forum:
“It seems to me that fighting has become in Wing Chun a Holy Grail with metaphysical proportions. It has become something that everybody is talking about, yet nobody knows or has ever seen. That’s the reason why it doesn’t matter in Wing Chun whether the training forges real fighters or not; it completely suffices when the training generates the believe that this is the best way to prepare oneself for a tough fight. The (supposedly) aggressive attitude towards fighting, even though fighting itself remains somewhat unreal, is one of the reasons for this phenomenon.”
(Taken from http://www.wt4um.de/viewtopic.php?t=8330&postdays=0&postorder=asc&start=0)
I know that this topic has been discussed plenty of times, yet I find this post to describe rather accurately the problem prevailing in the Wing Chun scene. Robotic prearranged moves in drills that are chewed over and over 'til exhaustion + believe in an instructor who has never fought competitively to do a reality check on his real skills = Present state of Wing Chun.